Digging-machine.



W. M. HALE. DIGGNG MACHINE.

APPLICATION FILED 1111111.19, 1912.

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DIGGING MACHINE.

APPLICATION FILED MAR. 19, 1912.

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'L39,932 Patented Oct. 1, 1912.

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DIGGING. MACHINE.

APPLICATION FILED MAR.19,1912,

Patented 0G13. 1, 1912.

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wiLLI'A'M' M. HALE, or CHARLESTON, soUrH CAROLINA.

Specification of Letters Patent.

Patented oet. 1 i912..

'Application led March 19, 1912.' Serial No. 684,881.

. for breaking a bank `of materialv for the purpose j of being removed or otherwise treated by other machines.

A special use for the machine is found in digging down banks of acid phosphate 1n fertilizer works, although it isA to be understood that no limitation ijs implied with respect to the uses of which the'machine-is 'capable The machine is characterized by improvements with respect to the means for supporting, adjusting and controlling rotary digger blades or knives. The lblade or blades are mounted on a shaft atl the end of a boom, which boom may be raised or lowered by means of a winding drum and tackle. The inner end of the boom is connected to a pair of cranks which may be operatedto advance or retract the boom lengthwise. The shaft which carries the blades is ro tated by means of chain belt and sprocket gearing so Varranged as to drive the same in any angular or longitudinal position in which the boom is placed.

rllhe longitudinal movement provided' 'for the boom by means of the crank enablesl the digging head to be quickly placed' in any position. desired, since it may be advanced or retracted -without disturbing the KAwindlass or winding drum by which the major lift or drop of the boom is effected.

The apparatus referred to above is mounted on a rotating platform which in turn is carried on a car, so that the digger may be used to work along a pile Yor bank, or in a large bin or storage chamber, and so manipulated or controlled as to reach any desired part of the material.

The' mechanism for rotating the table or platform, and for driving the car, may be operated by the same motor that operates the digger, or by any other mechanism suitable for the purpose, and since means for driving a car and for turning a platform are well known in the art, a description thereof is omitted in the present specification, the vinvention 'being directed particuf f larly to the digger devices which are mounted on the turntable.

In the accompanying drawings, in which the invention is illustrated-Figure 1 is a side elevation of the'machine.: Fig. 2 is an end elevation, parts being omitted. Fig. 3

is a top view of the turntable, parts being omitted, showing especially the motor and the windingv drums driven thereby. Fig. 4 is a plan of the boom and the knife shaft carried thereby. Fig.A 5 is a side view and Figi. 6 is a top view, enlarged,'showing the arm and cutting blade carried thereby.

Referring specifically tothe drawings, 6

indicates the caronl'which the machine is mounted, and 5 is the turntable or revolving platform thereon. As stated above, the car may be' driven and the platform revolved by any suitable means. The platform carries a standard composed of two columns 15 and a cross piece 15a' at the top. The boom is a skeleton structure composed of two beams 22, with cross braces, and with bearing pieces L6 at the-inner ends which bearing pieces receive a shaft'60. This shaft eX- tends through the eyes at the ends of crank arms 21 which are keyed or otherwise secured to a cross shaft 19 mounted in bearings 35 on the legsl of the standard. This shaft may be rocked by Ameans of a grooved segment 2O to which is attached a cable 54 connected to a drum 29 which has a brake 29a which may be applied to hold the parts in any adjusted position. Power is applied tothe drum 29 by means of a sprocket chain 61,-from a shaft 62 which isdriven through spur gear 53 and pinion 52 from an electric motor N1, these parts being mounted on the turntable.

By the means described the cranks 21 may be swung, and when they are swung the boom is advanced or retracted lengthwise to a desired extent. j

For raising or lowering the boom it is provided with ayoke 4 connected by eyes 31 to the digger shaft 63 at the outer end of the boom, the yoke being connected by suitable bridges the`joint.

Figs. and 6, the inner member of each arm being indicated at 41, keyed to the shaft 63, and the outer member of the arm being indicated at 41a,'to which the blade is attached, the members being connected by a pivot pin at 41". A spring 12 is .attached atits opposite ends to the res ective members, and

rdinarily the sprin keeps the members of the arm in line wit on which the arms aremounted is rotated each other, rbut` vshould the cutting blade strike any substance so hard that it willnot penetrate, the spring atvthe joint will allow the outer vmember to Aswing backward and pass the obstruction. This prevents breaking of the arm or the blade. The shaft 63 by means 'of a wheel 30 connected by a chain belt 30a to a sprocket 30b fast on the shaft 60. This shaft is driven vby -sprockets 60 chain belt 60b and sprocket 60'0'11 the'hub 49 of a pulley 49, this sprocket and pulley being loose on the shaft 19. The pulley 49 is on a shaft 42 carried in bearings 48 von the upper part of th'e standard, and the sha-ft 42 is driven by a pulley 16. and belt 50 from a pulley 13 on the shaft of the motor M. The

' arrangement is such that transmission devices will operate to drive the blade shaft in all positions of' the boom.

' In the operation of the machine-the boom is placed in proper position, preferably at the bottom of the bank to be dug and is- .then advanced to drive v the .digging head into the bank, the advance of the booml being, effected by means of the cranks 21 and the operating devices therefor. 'Then as'A the work progresses the boom is raisedby vthe winding drum 29 and tackle,'and the knives will cut into the bankand dislodge the material. The turntable may be turned to swing the boom to any v'desired position, laterall and'by-means of the hoisting device and the lxther boom controlling devices the digger head may be ositioned according tothe workat hand for t e purpose of break- Witnesses:

ing do n or excavating the bank. The control of he boom by means of the crank will give a considerable range of operation from one position on the car, although when necessary the car may be moved along to permit operation on other sections of the bank.

What I claim as new is:

1. In a diggingmachine, the combinaof astandard, av cran-k mounted at the lower part thereof, meansto swing the crank,` a

boom pivotallp-yconnected at' its inner end to the crank, wherebly; it may be moved lengthwise Ilby the ycran ra rotary digger at the outer end of the boom, achoisting cableconnected to.v the outer endgof the'boom tolift and lower thefsame, yand means to rotate the digger including a shaft located at Vthe .pivotal connection between the crank and boom d 3. n a ig of a standarl, A which .is pivotally connected tolfthe lower part ofthe standard, hoisting devices connected between the outer end of the boom and the top of the standard to raise or lower .the boom, independent means blo-advance or retract ,the boom len 'thwise, a rotary digger at Athe outer end of e boom, and means to rotate the digger independent of the movement of the boom.- .y

In testimony whereof, I aflixmy signa- .ture in presence of two witnesses.y

wiLLIAM M. HALE. J

W. W. HsELDEN, -T.-'J. Lrrscom'z.

gmachine, the'v combination I `a boom the .inner `endv of' 

